The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 1999
Filed:
Jun. 20, 1997
Masashi Nakano, Niigata, JP;
NEC Corporation, Tokyo, JP;
Abstract
A cylindrical pump device comprises a cylindrical housing and a cylindrical rotational member disposed in the cylindrical housing for rotation around the axis of the cylindrical housing. The cylindrical rotational member has a solid cylindrical wall, a central hub and a plurality of flexible blades extending between the central hub and the solid cylindrical wall for defining a plurality of liquid chambers therebetween. The cylindrical housing supports a shaft apart from the central axis of the cylindrical housing. During rotation of he rotational member, the chambers far from the central axis first increases its volume to introduce liquid ink therein and then decreases its volume to discharge the liquid ink from the chamber. Inlet valve or outlet valve for the pump are not necessary to reduce the parts and fabrication cost of a pump system.